Hi, i've been doing this for a while now and i thought that i could share it with you guys here at mmowned.
I've looked around and couldn't find it so here we go.
When you're inside the dead scar for the quest "The air strikes must continue" you can use your arcane charge twice (or more) in one cooldown by simply hotkeying the item to a button, then you use it and just before you shoot the charge, hit the hotkey again so you have the targetting circle again.
With this targetting circle out, you can shoot the charge again while it's on cooldown.
I hope this helps anybody who's having trouble with the quest